问题
选择题
Only after you explained it to me ____ it was not my teacher’s fault.
A．I realized
B．had I realized
C．realized I
D．did I realize
答案
答案：D
考查倒装结构。Only放在句首，后接状语从句，主句的主谓要倒装。根据句意用一般过去时，选D。
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